Resilient member having parallel terminal surfaces



Aug. 19, 1952 w. H. F. JURGENS RESILIENT MEMBER HAVING PARALLEL TERMINAL SURFACES Filed July 20, 1946 I 1 INVENTOR.

WILL] HHWKH 1-2112 JUPGHVIS'.

BY W

AGENZT Patented Aug. 19, 1952 j H PATENT RESII5IENT HAVING PARALLEL *TERIWINAL SURFACES WtillL Heinrich Fritz Jiilgens;-Ei1 dhoven,j.l\leth- .erlanils assignor {to Hartford .NationaljBank and'Trust'compa a ord.Conn-{ urmis JApplieation; July: 20; 1946-, Serial NJ26'85fl46 'i-ln iBelgiumMayuz, 1945 "25iCla'ims.

fiThis .inyention -relates "to. -a,resili'ent----member having'parallel terminal surfaces. 7

f R'esilient members of jthisv kind "are used if -1t is necessary 'to exert a spring pressure which, insteadof being localyisdivided more or less through the surface. "Such is the case, forexample, fif'the axial 'playmust'be'taken out of ii -shaft with the aid of a resilient member. "In order .to avoid undesirable effects, the :resultant of the {forces exerted bytheresilient member must be'locatedapproximately in the centre'- line ofthef shaft. To-this end. it"is' necessary forthe said fumes to besomevzhatdividad over a circle concentric with the shaft.

A: known resilient member having. parallel terminal surfaces is constituted by a helical spring of which the #:twofitur'ns at; its extremities have particular shapes. This member does not always satisfy the requirements imposed. and notably it is not possible to divide the elastic forces satisfactorily withdifferentimpressiom of the spring.

.-..A' further known .resilientzmem'ber with-p allel terminal surfaces is madewin the form of a sprin -Brine Substantially fionstituted by 3a, plane plate furnished with radial notches. The :parts located in between thesenotchesuare bent out of the surface 'of the plate and serve as resilient elements. In this construction it is difiicult'to obtaima'asmall .stiffness due to "ithe small length of ithe;resi1ient. elements. 'Moreover, in case of overload a deformation or even fracture of one or more of the resilient elements readily occurs, resulting in a variation of the elastic properties of the spring ring.

The present invention relates to the construction of a resilient member with parallel terminal surfaces in which the drawbacks of the known construction do not occur and by which furthermore other advantages may be obtained. According to the invention, the resilient member is constituted by at least three helically wound resilient elements of same shape which are arranged coaxially but in positions which are mutually turned about the axis of the helix through angles larger than 90, the arrangement being such that the extremities are located in two planes normal to the axis of the helix. Consequently, the resilient action is exerted in at least three points located about the axis of the helix. This remains the case with any permissible impression of the resilient member. A particular shape of the turns at the extremities is not required. By means of a symmetrical arrangement it is possible to cause the resultant of the elastic forces to fall in the axis of the helix.

' The iiILVBIltiOIl5-Wi1I .now 1 .be expla'ined= more fully by reference to the accompanyingcdrawing, in. which,

Figure 1 showsfaaresilient member according to the-invention,=the length of :which is largervthan its: diameter, and

:FigurezZ. showsta furtheriresilient.memher. according :to the invention; the .:length; ofzwhichds smaller ithan a quarter of .its diameter.

resilient.member.- ofthe; kind showmin Figure 1 .is constituted. byi'threeselements .1; 2 :andsS of wspringsteelewire, :which .are helicallyewound in; a .tcounter clockwise :manner. and e-whichez-zare coaxially. arranged .sothatitheir..=extremitiemare located .in.;two .aplanesinormal to:the;t-a-x-is;=4 10f ::the helix. "Theyraremutually turned about it-ha-axis through angles of Three helical zzsprings 5, .iifinand 1 .which :are clockwise: woundandiof somewhat smaller diameter are zarrangedsin 5a manner. similar :to springs I I -2 land 3-: and Iconcentrically with'zthe:latter. 1Now,. one extremity of a counterclockwise awound :selement: aistconnected. with anxiextremity of a clockwise twourid element locatedrin:theLsame:terminaLsurfaceEtby means ;of a \loop located in nthis aterminal surface. Thus, element [is connected:-withuelement 12 byzmeansof. asloop v8:1locatediinithe.uppeissurface. ThBjiWl'IOIB .of :the resilient-:member may thusibe ma'de. from one. piece of spring :steel-iwire. Upon: impressiondue to a i force. zexerted -in the axis .of' the helix/the upper.andlthe bottom -planes touching the three ends of the resilient elements located in the loops, remain parallel to one another.

The resilient member shown in Figure 2 has the shape of a spring ring and may be used to eliminate an axial play from a shaft. It is built up from three parts made from spring plate, each of which has an approximately V-shape and serves as a resilient element. The spring ring is constituted by three resilient elements 20-22 wound counter clockwise and three resilient elements 2325 wound clockwise. Each element extends through a third of the circumference. The resilient members are assembled to form one unit by one extremity of a counter clockwise wound element and one of a clockwise wound element being fixed at three points to the base. Due to the fact that the resilient elements are placed tangentially, they may be larger than in the known construction with unvaried dimensions of the spring ring. It is thus possible, if desired, to obtain a small stiffness, while overload does not readily occur. With the spring ring shown in Figure 2 all the resilient elements come to lie on one another in case 01' overload, due

3 to which with still greater load there is no further deformation of the spring ring. Permanent deformation or fracture of the resilient elements is thus impossible.

The resilient member described may also be used with advantage for establishing an electric contact between parts located on each side of the member.

What I claim is:

1. A resilient member, comprising a plurality of helically wound resilient elements extending between two terminal planes perpendicular to the axis of the helix, said resilient elements being arranged coaxially in positions equally spaced about the said axis, at least three of said elements being wound clockwise andan equal number of said elements being wound counter- I clockwise, each clockwise wound element in the said terminal planes being joined to a counterclockwise wound element, the resulting joints in each terminal plane being equally distributed about the said axis.

2. A resilient member, comprising a plurality of helically wound resilient elements extending between two terminal planes perpendicular to the axis of the helix, said resilient elements being arranged coaxially in positions equally spaced about said axis, at least three of said elements being wound clockwise and an equal number of said elements being wound counter-clockwise, each clockwise Wound element in the said termi-' nal planes being joined to a counter-clockwise wound element so that each of the said elements constitutes a different portion of a continuously wound resilient member, the resulting joints in each terminal plane equally .distributed about the said axis.

3. A resilient member, comprising a plurality of helically wound resilient elements extending between two terminal planes perpendicular to the axis of the helix, said resilient elements being arranged coaxially in positions spaced about the'said axis, at least three of said elements being wound clockwise and an equal number of said elements being wound counter-clockwise, each clockwise wound element in the said terminal planes being joined to a counter-clockwise wound element, the resulting joints in each terminal plane being equally distributed about the said axis, each of the said resilient elements surrounding the axis of the helix over an equal angle.

4. A resilient member, comprising a plurality of helically wound resilient elements extending between two terminal planes perpendicular to the axis of the helix, said resilient elements being arranged coaxially in positions spaced about the said axis, at least three of said elements being wound clockwise and an equal number of said elements being wound counter-clockwise, each clockwise wound element in the said terminal planes being joined to a counter-clockwise wound element, the resulting joints in each terminal plane being equally distributed about the said axis, said resilient elements surrounding the said axis of the helix over an equal angle, the said resilient parts together surrounding the said axis twice.

5. A'resilient member, comprising six helically wound resilient elements extending between two terminal planes perpendicular to the axis of the helix, said resilient elements being arranged coaxially in positions equally spaced about the said axis, three of said elements being wound clockwise and the other three of said elements being wound counter-clockwise, each clockwise wound element in the said terminal planes being joined to a counter-clockwise wound element, the re sulting joints in each terminal plane being equally distributed about the said axis, eachof the six elements surrounding the said axis of the said helix over an equal angle, the said resilient parts collectively surrounding the said axis twice, the distance between the said terminal planes being less than a quarter of the diameter of the said member. I

WILLI HEINRICH FRITZ JI IRGENS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Great Britain Jan. 23,: 1928 

